<!DOCTYPE html>
<html>
<body onload="myFunction(event)">

<h1>Hello World!</h1>

<p><strong>Note:</strong> The onpageshow event and the persisted property is not supported in Internet Explorer 10 and earlier versions.</p>

<script>
function myFunction(event) { 
  if (event.persisted) {
    alert("The page was cached by the browser");
  } else {
    alert("The page was NOT cached by the browser");
  }
}
</script>

</body>
</html>
